Video Wall System

1. A video wall system, comprising: software running on a host computer, for a user to input size of each screen of a video wall, to calculate a delay time for each row of screens of the video wall; and a video wall control device, coupling the host computer to the screens, wherein: the video wall control device outputs a plurality of split videos to the different screens through separated output ports, and drives each row of screens to display according to the delay time calculated for the row of screens, wherein the screens of the same row correspond to the same delay time; and based on a first vertical screen resolution of a first row of screens, the software running on the host computer calculates a delay time of a second row of screens adjacent to the bottom of the first row of screens.

2. The video wall system as claimed in claim 1, wherein: the video wall control device makes a second vertical synchronization signal of the second row of screens lag behind a first vertical synchronization signal of the first row of screens according to the delay time the software calculates for the second row of screens.

3. The video wall system as claimed in claim 2, wherein: when calculating the delay time for the second row of screens, the software running on the host computer further considers a vertical video resolution and a refresh rate of split videos corresponding to the first row of screens.

4. The video wall system as claimed in claim 3, wherein the software running on the host computer calculates the delay time for the second row of screens based on a calculation: t_delay=(h1/h_data1)·(1/f), where: t_delay is the delay time for the second row of screens; h1 is the first vertical screen resolution of the first row of screens; h_data1 is the vertical video resolution of the split videos corresponding to the first row of screens; and f is the refresh rate of the split videos corresponding to the first row of screens.

5. The video wall system as claimed in claim 3, wherein: the first vertical screen resolution of the first row of screens is different from a second vertical screen resolution of the second row of screens.

6. The video wall system as claimed in claim 3, wherein: the screens are light-emitting diode (LED) screens or liquid-crystal display (LCD) screens.

7. The video wall system as claimed in claim 1, wherein: the video wall control device uses a universal serial bus input port to connect to the host computer to receive compressed data of the split videos as well as the delay time for each row of screens.

8. The video wall system as claimed in claim 7, wherein: the output ports of the video wall control device are implemented by a high-definition multimedia interface.

9. The video wall system as claimed in claim 8, wherein: the video wall control device uses a single display chip to drive all screens to display their corresponding split videos.

10. The video wall system as claimed in claim 8, wherein: the video wall control device is implemented by a single display card; and multiple display chips are disposed on the single display card, and the single display card has a universal serial bus hub; the display chips drive the screens to display; and through the universal serial bus hub, the universal serial bus input port is coupled to the display chips.

11. The video wall system as claimed in claim 8, wherein: the video wall control device is implemented by a plurality of display cards; the display cards are connected in series through a universal serial bus interface; each display card is installed with a plurality of display chips for driving multiple screens, and has a universal serial bus hub that couples a universal serial bus input port of the display card to the display chips on the display card; and on each display card, the universal serial bus hub further couples the universal serial bus input port of the display card to a universal serial bus output port of the display card.

12. A video wall system, comprising: software running on a host computer, for a user to input size of each screen of a video wall, to calculate a delay time for each row of screens of the video wall; and a video wall control device, coupling the host computer to the screens, wherein: the video wall control device outputs a plurality of split videos to the different screens through separated output ports, and drives each row of screens to display according to the delay time calculated for the row of screens, wherein the screens of the same row correspond to the same delay time; the screens are the same in size; and the software running on the host computer calculates a delay time for a second row of screens based on a refresh rate of each split video, wherein, the second row of screens is adjacent to the bottom of the first row of screens.

13. The video wall system as claimed in claim 12, wherein: the video wall control device makes a second vertical synchronization signal of the second row of screens lag behind a first vertical synchronization signal of the first row of screens according to the delay time the software calculates for the second row of screens.

14. The video wall system as claimed in claim 13, wherein the software running on the host computer calculates the delay time for the second row of screens based on a calculation: t_delay=1/f, where: t_delay is the delay time for the second row of screens; and fis the refresh rate.

15. The video wall system as claimed in claim 14, wherein: the screens are liquid-crystal display (LCD) screens or light-emitting diode (LED) screens.

16. The video wall system as claimed in claim 12, wherein: the video wall control device uses a universal serial bus input port to connect to the host computer to receive compressed data of the split videos as well as the delay time for each row of screens.

17. The video wall system as claimed in claim 16, wherein: the output ports of the video wall control device are implemented by a high-definition multimedia interface.

18. The video wall system as claimed in claim 17, wherein: the video wall control device uses a single display chip to drive all screens to display their corresponding split videos.

19. The video wall system as claimed in claim 17, wherein: the video wall control device is implemented by a single display card; and multiple display chips are disposed on the single display card, and the single display card has a universal serial bus hub; the display chips drive the screens to display; and through the universal serial bus hub, the universal serial bus input port is coupled to the display chips.

20. The video wall system as claimed in claim 17, wherein: the video wall control device is implemented by a plurality of display cards; the display cards are connected in series through a universal serial bus interface; each display card is installed with a plurality of display chips for driving multiple screens, and has a universal serial bus hub that couples a universal serial bus input port of the display card to the display chips on the display card; and on each display card, the universal serial bus hub further couples the universal serial bus input port of the display card to a universal serial bus output port of the display card.